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STOCK PLANS (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Stock Incentive Plans |  |  |
Awards Reserved for Issuance (in shares) | 12,129,537 |  |
Employee Stock Purchase Plan (ESPP), Shares in ESPP | 500,000 |  |
Maximum Fair Market Value Purchase of ESPP Shares | $ 25,000 |  |
Employee Stock Purchase Plan fair value | 85.00% |  |
Awards Issued (in shares) | 10,451,985 |  |
Stock Purchased And Issued During Period, Shares, Employee Stock Purchase Plans | 64,740 |  |
Awards Available for Grant (in shares) | 1,677,552 |  |
Employee Stock Purchase Plan, Number of Shares Authorized | 500,000 |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans | 224,887 |  |
Employee Stock Purchase Plan, Number of Shares Available For Purchase | 275,113 |  |
Stock options |  |  |
Stock Incentive Plans |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options | $ 47,500,000 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | 2 years 10 months 7 days |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 19.34 | $ 20.78 | $ 19.13
Restricted Stock Units (RSUs) [Member] |  |  |
Stock Incentive Plans |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | 2 years 9 months 2 days |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ 19,200,000 |  |
Inducement Plan 2014 [Member] |  |  |
Stock Incentive Plans |  |  |
Awards Reserved for Issuance (in shares) | 175,000 |  |
Awards Issued (in shares) | 36,576 |  |
Awards Available for Grant (in shares) | 138,424 |  |
Two Thousand Seven Stock Incentive Plan [Member] |  |  |
Stock Incentive Plans |  |  |
Awards Reserved for Issuance (in shares) | 2,022,837 |  |
Awards Issued (in shares) | 2,022,837 |  |
Awards Available for Grant (in shares) | 0 |  |
Stock Incentive Plan 2011 [Member] |  |  |
Stock Incentive Plans |  |  |
Awards Reserved for Issuance (in shares) | 9,931,700 |  |
Awards Issued (in shares) | 8,392,572 |  |
Awards Available for Grant (in shares) | 1,539,128 |  |

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- Definition Employee Stock Purchase Plan, Number of Shares Authorized + References No definition available. + Details
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- Definition Employee Stock Purchase Plan, Number of Shares Available For Purchase + References No definition available. + Details
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- Definition The percentage of fair value of common stock eligible employees can purchase common shares at through an employee stock purchase plan. + References No definition available. + Details
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- Definition Maximum Fair Market Value Purchase of ESPP Shares in a Calendar Year + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested options awarded to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of share instruments newly issued under a share-based compensation plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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